Although Kiri Haimura seems like a typical boy, he has an abnormal obsession with cutting other people's hair. When he meets Mushiyanokouji Iwai, also referred to as the "Hair Queen," he learns that she cannot trim her own hair due to a hereditary curse. Kiri understands that only his scissors, the "Dansai Bunri no Crime Edge," have the capability of cutting her hair. However, their meeting triggers an ancient killing competition where participants use deadly instruments called "Killing Goods" to murder the "Hair Queen." With this challenge at hand, will Kiri be able to protect Iwai from malicious competitors? The deadly game has only just begun.